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A106008 Primes p such that 10*p - 3 and 10*p + 3 are both primes. 1

%I

%S 2,5,7,11,17,23,31,37,59,61,73,109,137,149,191,199,227,229,269,271,

%T 331,353,373,401,479,499,523,541,607,683,719,787,809,829,947,997,1061,

%U 1109,1181,1193,1297,1523,1531,1607,1619,1627,1657,1699,1733,1831,1879,2011

%N Primes p such that 10*p - 3 and 10*p + 3 are both primes.

%H Michael De Vlieger, <a href="/A106008/b106008.txt">Table of n, a(n) for n = 1..10000</a>

%t Select[Prime[Range[120]], PrimeQ[10#+3]&&PrimeQ[10#-3]&]

%o (MAGMA) [p: p in PrimesUpTo(2100) | IsPrime(10*p-3) and IsPrime(10*p+3)]; // _Vincenzo Librandi_, Nov 13 2010

%K nonn

%O 1,1

%A _Zak Seidov_, May 05 2005

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Last modified June 5 08:21 EDT 2020. Contains 334829 sequences. (Running on oeis4.)